Modified biomass activated coke mercury removal adsorbent and preparation method thereof

A biomass and activated coke technology, applied in chemical instruments and methods, separation methods, other chemical processes, etc., can solve the problems of affecting the quality of by-products, narrow temperature window, high operating cost, etc., to improve the chemical mercury adsorption conversion capacity, damage Low, the effect of reducing production costs

Active Publication Date: 2014-01-01
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most commonly used adsorbent is commercial activated carbon, which has been tested in actual operation in the United States and Europe, and has obtained better mercury

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Dilute concentrated phosphoric acid with a mass percentage of 85% to 40% by mass, crush and dry rice husks, sieve, and select particles with a particle size of less than 100 mesh for use. Weigh 10 g of rice husk particles and place them in 75 g of the above-mentioned diluted phosphoric acid solution (mass ratio of rice husk particles to phosphoric acid is 1:3), and use a magnetic stirrer to continuously stir for 24 h, filter, and the obtained rice husk particles at 45 Dry at ~50°C in N 2 Under the atmosphere, after the temperature of the furnace rose to 500 °C, the rice husk particles impregnated with phosphoric acid were sent into the furnace for pyrolysis and activation. After 60 min, they were taken out and stored in a desiccator. The rice husk activation material was taken out and washed with deionized water. , until the pH value of the washing filtrate is 6-7, and drying at 45-50°C to obtain rice husk activated coke.

[0029] Weigh 1 g of ammonium bromide and plac...

Embodiment 2

[0031] Dilute concentrated phosphoric acid with a mass percentage of 85% to 60% by mass, crush and dry rice straw, sieve, and select particles with a particle size of less than 100 mesh for use. Weigh 10 g of rice straw particles and place them in 50 g of the above-mentioned diluted phosphoric acid solution (mass ratio of rice straw particles to phosphoric acid is 1:3), and use a magnetic stirrer to continuously stir for 12 h, filter, and put the obtained rice straw particles at 45 Dry at ~50°C in N 2 Under the atmosphere, after the temperature of the furnace rose to 600 °C, the rice straw particles impregnated with phosphoric acid were sent into the furnace for pyrolysis and activation. After 30 min, they were taken out and stored in a desiccator. The rice straw activation material was taken out and washed with deionized water. , until the pH value of the washing filtrate is 6-7, and drying at 45-50° C. to prepare rice straw activated coke.

[0032] Weigh 0.5 g of ammonium b...

Embodiment 3

[0034] Dilute concentrated phosphoric acid with a mass percentage of 85% to 20% by mass, crush and dry sawdust, sieve, and select particles with a particle size of less than 100 mesh for future use. Weigh 10 g of sawdust particles and place them in 50 g of the above-mentioned diluted phosphoric acid solution (the mass ratio of sawdust particles to phosphoric acid is 1:1), and use a magnetic stirrer to continuously stir for 18 h, filter, and place the obtained sawdust particles at 45-50 °C Dry under N 2 Under the atmosphere, after the temperature of the furnace rose to 400 °C, the phosphoric acid-impregnated sawdust particles were sent into the furnace for pyrolysis and activation, and were taken out after 90 min and stored in a desiccator. The sawdust activation material was taken out and washed with deionized water until The pH value of the washing filtrate is 6-7, and it is dried at 45-50° C. to obtain sawdust activated coke.

[0035]Weigh 1 g of ammonium chloride and place...

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PUM

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Abstract

The invention discloses a modified biomass activated coke mercury removal adsorbent and a preparation method thereof. The mercury removal adsorbent is biomass activated coke undergoing phosphoric acid activation and halogenated ammonium salt modification dual treatment. The preparation method includes: immersing biomass particles into a phosphoric acid solution to conduct continuous stirring impregnation, performing filtering and drying, then under an N2 atmosphere, carrying out pyrolysis activation on the biomass particles subjected to phosphoric acid impregnation treatment; then conducting washing till the filtrate has a pH value of 6-7, and performing drying under 45-50DEG C; immersing the biomass activated coke into a halogenated ammonium salt solution, and carrying out continuous stirring impregnation for 1-2h; and conducting filtering and drying so as to obtain the modified biomass activated coke mercury removal adsorbent, which has the advantages of convenience and simplicity, less pollution, easy industrial popularization and the like.

Description

[0001] technical field [0002] The invention belongs to the field of comprehensive utilization of biomass resources and mercury removal of industrial waste gas, and relates to a method for preparing a mercury removal adsorbent by using phosphoric acid activation and ammonium halide salt modified biomass coke. [0003] Background technique [0004] Mercury and its compounds are a class of toxic and harmful substances. A small dose of mercury can cause great harm to human health and the natural environment such as ecology, water, soil and atmosphere, and it has inter-regional migration, bio-enrichment, food chain toxicity transfer, and strong latent and other features. In addition to natural causes, human activities such as fossil fuel combustion, metal smelting, cement production, chlor-alkali industry, and municipal industries have increasingly become important sources of mercury pollution in the atmosphere. At present, many countries around the world have formulated laws...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B01D53/02
Inventor 朱纯段钰锋佘敏周强洪亚光张君
Owner SOUTHEAST UNIV
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